2. Everybody loves a good "underdog takes over from the big bad empire in decline" story, both the press and the commenting public. The stories about big companies absolutely crushing their competitors in quality are just not as interesting.
3. AMD can't scale up as rapidly as a SAAS because fabs take a while to build. I'd wager Intel has (at least) five to ten years to come up with a good processor design before they get overtaken by AMD in sheer volume.
4. There are no doubt Chinese competitors with even lower sales and even higher P/E and growth rate than AMD. It'll be interesting to see how that plays out.